Grizzly G0709 - Manual (Page 38)

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Model G0709 (Mfg. Since 5/11)
figure 38. Finished dead center.
the tailstock alignment was set at the factory with
the headstock. however, we recommend that you
take the time to ensure that the tailstock is aligned
to your own desired tolerances.
When clamped in place, a tailstock experiences
compression that draws its centerline downward
into alignment with the spindle centerline. this
distance is usually a few thousandths of an inch.
When a tailstock lock lever is used by feel, or
when used by different machinists, this alignment
can be inconsistent.
to eliminate this variable, a 1 ⁄
2
" drive ft/lb torque
wrench can be inserted into the lock lever drive
hub. the tailstock can then be clamped in place at
a pre-determined torque setting. All operators can
then rely on the same amount of draw-down align-
ment that is based on the same torque setting.
To align the tailstock:
1. Center drill a 6'' long piece of bar stock on
both ends. set it aside for use in Step 4.
2. Make a dead center by turning a shoulder
to make a shank. Flip the piece over in the
chuck and turn a 60° point (see
figure 38).
As long as it remains in the chuck, the point
of your center will be accurate to the spindle
axis.
Note: Keep in mind that the point will have
to be refinished whenever it is removed and
returned to the chuck.
Aligning Tailstock
figure 39. Bar stock mounted between centers.
7. Measure the stock with a micrometer. if
the stock is wider at the tailstock end, the
tailstock needs to be moved toward the front
of the lathe the amount of the taper (see
figure 40).
figure 40. Adjusting for headstock end taper.
looking down from above.
5. turn approximately 0.010" off the diameter.
6. Mount a dial indicator so that the plunger is
on the tailstock quill (see figure 40).
3. place the live center in your tailstock.
4. Attach a lathe dog at the spindle end to the
bar stock from Step 1, and mount it between
the centers as shown in figure 39.